Quantifying helium distribution in dual-ion beam irradiated SiC_f/SiC composites by electron energy loss spectroscopy

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• 作者：K.F. Chen^a ; C.H. Chen^a ; Z.H. Zeng^a ; F.R. Chen^a ; J.J. Kai^a ; ^b ; ^{jjkai34282@gmail.com}
• 关键词：Helium density ; EELS ; Hi-Nicalon Type-S (HNS) SiC composites ; Helium bubbles ; Fusion reactor ; Dual-ion implantation
• 刊名：Progress in Nuclear Energy
• 出版年：2012
• 期刊代码：42_01491970
• 类别：pw
• 出版时间：May, 2012
• 卷：57
• 期：Complete
• 页码：46-51
• 文件大小：1096 K

摘要

In this study, we report a method to quantify the helium distribution in the SiC_f/SiC composites, which are used as the first-wall materials of fusion reactor. The helium-bubble formation in Hi-Nicalon Type-S (HNS) was observed in the irradiated SiC_f/SiC composites at a level of 100 dpa and at 800 掳C and 1000 掳C, respectively. We applied transmission electron microscopy and electron energy loss spectroscopy to investigate the helium-gas-bubbles-formation mechanisms. To simulate the practical first-wall environment of Deuterium-Tritium (D-T) fusion reactor, a dual-ion beam (6 MeV Si³⁺ and 1.13 MeV He⁺) was performed to irradiate the SiC_f/SiC composites. The relationship between the energy shift of He K-edge and the radius of the bubble of the SiC composites was estimated by electron energy loss spectroscopy analysis. The results show that all of the helium atoms irradiated at 1000 掳C and formed the bubbles. On the other hand, at 800 掳C, only 25.5%of the helium atoms form the helium bubbles. A clear thermal-dependent formation mechanism is found.